Printing telegraph receiver



April 25, 1950 R. D. SALMON 2,505,008

PRINTING TELEGRAPH RECEIVER Filed Deo. 15, 1946 3 Sheets-Sheet 2 Inventor A Hur/ley N L 0 u 8 s M 0 t ma m m, mw m 0 .m WM o 5, .r ,NN w 2 .n lu A .m D S m Y 3 W B m R R. D. SALMON PRINTING TELEGRAPH RECEIVER April 25, 1950 Flled Dec 13 1946 Patented pr. 25,.y 19500 UNITED STATES PATENTS" OFFICE 2,505,008 l PRINTING TELEGRAPI REE'Ivn' Reginald Dnnissalnion, Croydon, EnglancLas'.- signor' lto Creedand Company Limited', Croy donyEngland, a British company Application December 13, lafiaserial No. 715,904"

In Great'Britain November 6,1945

section Lv-Publi@ Law ssaaugust s, 194e Patent expires November 6, 1965 receiver should be fitted with an orientation device, that" is a device whereby the operation' oi the selector mechanismmay be co-ordinated with' theincoming signalimpulses; 'as the presence of such a device permits the tolerance of a machine tc distorted signals tobereadi'ly determinediand thus permits a mechanic toy determine Whether he has carried out the'reduired adjustment'. More? over sucha device enables the machine to receive correctly signals having a greater, amount of'dis"" tortion than it would receive without siich device".`

In U. S. Patent 2,286,248;issuedtoll W; 1J. Jenner on June 16, 1943, there is describedandclaimed, a selector mechanism for a printing telegraph" receiver in which `the stop or rest position'of the cam assembly is invariable and in'whi'ch oriental` tion'adiustment is enecte'dbya variationin theA time intervalbetween the reception'oi afstartV impr-.leev and the disabl'ement ofthe mechanism retaining the cam assembly in the vstonbr "restv positions; For this purpose'a'separate cam disc is provided which is released for rotation by the response'of themagnet armature to" the start'elef" ment of a signal and itself releases the selector cam assembly for rotation. The stop position of the separate cam disc is adjustable' and thus 'the tia-ire interval between the'releaseofthe 'separate' cam disc and the release of the selector 'caniv assembly is adjustable.

It is theobject of thepresent invention tofpr'oj vde an orientation adjustment device thatv can' be ntted to a machine already in current manufv facture without affecting the general design 'and arrangement of parts of the said machine." Spe-'L' cicaliy it is the object of the'pre'sent inventinI to iit an orientation adjustment device 'to 'the Well-known Teleprinter No. 'ZBwhichis ffconstructed and operates as described in A,Sfliateat No. 1,639,213, granted Augustegiea: y

According to the present'invention' We" provide a printing telegraph receiver comprising'a mag-i net, an armature therefor, a driving shaft, a selector cam and a starting cam both arranged coaxiaiiy with said drivipglshaft-a friction' clutch for K driving said starting cami'romsaid driving shaft, a ratchet clutch `for f'driving' said selector cam from said' driving shaft', a'detent'for liol'dingsaid starting cam in" an 'j invariable stopvk position"l against'rotation, Ymeansfor releasing engagement"v of saiddetent from said starting'cam uponjthe' response of" said arniaturetofthe start element of a signal, a lug on saidstarting'cam, a"member` mounted in the path' of said lugfm'anua'lly operable means for adjustingtheiriositionbisaidE member in a path coaxial with said starting'cam" l and means operable upon'the 'coaction of'sa'id lug Vwith said member to" caus'eiengaigem'entef sad ratchet clutch."

The invention Will be'bettenundrstood from the following description' taken` in" conjunction' with' the accompanying' drawings" in which:

Fig. l shows the.. cam shaft of the machine described in said U. 'SL' Patent No.f"l,639,213 with the modifications according to the presentinven-' tion.

Fig. 2 is an end View 'of'Figgd looking inthe direction of the arrow,'fan d of the'starting'mechal' nism according to "thev presentA invention.

Fig.` '7V showsv the arrangement for releasing thel ratchet clutch. Fig. 8 is a perspective View 'of 'theo-rientation device andof'the starting'mechanism according to the presentinvention.

Referring to the drawings,- Fig. 1 shows the cam assembly for the` machine described vin saidV Patent 1,639,213. Y A,

The machine includes 'the driving spindleior shaft l for the cam assembly which is mounted in plainbearingsS. The cam assembly 2 carries afcam groove '4 'Whichf-'actuates' a striker' pin (not shown) and which is 'hereinafter referred to as a selector cam, since' the instants atwhich the striker pin is actuateddetermine the'selector action and these instants ought to occur at the middle of eachcodeelement ofithe signai combi" nation The camassembly 2 valso carries other cams for determining the traversing ofthe strikerl pin and for performing other functions, ibut'as these operations are'fully described in the above mentioned specification and are not` necessary'to an understanding,of;the^present invention, theyneed not be described hereinj rlhe shaft I is co-nf tinuously `driven during the `operation ofthe machine by means ofa gear wheel 5. TheV shait I passes coaxially through the cam assembly V and carries ratchetV Wheei'sn for cooperation with pawis 7 (Fig. 7*) lpivotally carried at la by the cam detent lever I4 in place.

assembly 2, the combination of ratchet wheels 6 and ypawls 1 constituting a ratchet clutch between the shaft I and the cam :assembly 2. The ratchet clutch is held inoperative until the proper moment by means of a detent 8 (Fig. 7) which holds the pawls 1 out of engagement with the ratchet wheels 6.

An extension of the shaft I beyond the driving gear wheel and one of the bearings 3 carries a friction clutch 9 driving a disc I6 having on its outer edge two lugs II and I2 bent over in opposite directions. One lug II co-operates with one arm I3, Fig. 2, of a detent lever I4 pivoted at I5. The other arm I6 of the lever I4 is engaged by a retaining lever I1 urged by a spring I8 towards the arm I6. The retaining lever I1 thus holds lever I4, against the pull of a spring I9, with arm I3 holding cam disc I0 against rotation.

The retaining lever I1 is adapted to be withdrawn from engagement with arm I6 of detent lever I4 by a latch member 26 attached to a hub- 2I pivotally mounted in an arm 22. Arm 22 is attached to the rock shaft 23 that carries the striker pin guides, and is denoted by reference character 1 in Fig. 1 of said Patent 1,639,213. This rock shaft 23 carries a second arm 24 connected by a link 25 to the armature 26 of the operating magnet 26a.

The latch 2t is normally held in engagement with the retaining lever I1 by a spring blade 21 mounted on arm I6 of detent lever I4. A step 28 formed on arm I6 holds the spring blade 21 so that it does not normally press against latch 20 so that the latch 26 is free to move without friction.

When the armature 26 moves in response to the start element of a signal combination, it moves to the right in Fig. 2 and thus rotates shaft 23 and with it arm 22 in a counter-clockwise direction, thus moving latch 20 to the right to be free of arm I6 of detent lever I4. Detent lever I4 is accordingly rotated counter-clockwise about its pivot I5 and arm I3 is removed from engagement with lug II on cam disc II) thus allowing the latter to be driven through friction clutch 9 from shaft I. When detent lever I4 rotates counter-clockwise arm I6 lifts latch 20 clear of retaining lever I1 so that subsequent movement of the armature 26 due to the code signal combination is free of the load of spring I8, which.`

acts on retaining lever I1.

The cam disc I6 rotates in the direction of the arrow in Fig. 2 and towards the end of rotation thereof lug I2 thereon engages a roller 29 r pivoted on pivot 23a carried by arm I3 of lever I4 and thereby rotates lever I4 in a clockwise direction, so that the end of arm I3 is brought into the path of lug II and arm I6 is again engaged by retaining lever I1 which is moved clockwise against spring I8 until the end thereof snaps over the end of arm I6 and thus holds Latch 2li is again brought into engagement with retaining lever I1. If at this moment armature 26 is in its right hand spring position, the latch 26 will be brought down on top of retaining lever I1 and spring blade 21 will be slightly deected. When the armature 26 nally moves to the left hand (stop) position the latch 26 will spring down under the influence of the spring blade 21 to be ready again to withdraw the retaining lever when the next start element is received.

The lug I2 also co-operates with a roller 30 pivoted on pivot 30a (Fignl) carried by a level.`

3| carried by a frame 32. The frame 32 is slidable over an arcuate portion 33 of the xed framework of the machine so as to move the roller 30 coaxially of the cam disc I0. For this purpose frame 32 is provided with a knob 34 which can be readily grasped by the hand. The knob 34 is provided with a screwed shank 35 which screws into the portion 33 of the framework. To move the frame 32, the knob 34 is rotated to unscrew the shank 35 from engagement with the portion 33 of the fixed framework. The

' frame 32 and with it the lever 3I and roller 33 may then be moved and after adjustment to a new position knob 34 is screwed up to tighten the frame 32 in the new position and hold it against movement. The frame 32 carries a pointer 36 and the portion 33 of the framework a graduated scale4 31 cooperating therewith.

Mounted on the same pivot with the roller 36 is another roller 38 Fig. 6 that cooperates Vwith a lever 33 mounted on a spindle 46 journalled in Xed bearings mounted on the base of the machine. Lever 39 is urged by spring 4| into contact with roller 38 and the portion thereof that cooperates with the roller is shaped so that the centre of curvature is on the axis of rotation of driving shaftI and cam I6, for the position of lever 39 shown in Fig. 4. Mounted on the other end of spindle 46 is a detent lever 42 connected by a link 43. to the detent lever 44 that is normally holding pawls 1 out of engagement with ratchet wheels 6 against the pressure of their associated spring 44a.

Fig. 8 shows in perspective the orientation device and the starting device with each essential element of the device shown in relation to each of the other elements thereof. The same character numerals used in Figs. 1 through 7 are used to identify similar elements in Fig. 8.

The operation of the device is as follows:

'I'he response of the armature 26 to the start element of a signal withdraws retaining lever I1 from engagement with detent lever I4 and the latter is immediately withdrawn from engagement with lug II of cam Ill. Cam E3 is driven through friction clutch 3 from driving shaft I and rotates. After an interval, depending upon the setting of roller 30 by means of frame 32, lug I2 on cam I engages roller 36 and thereby rotates lever 39 and with it spindle 46 and lever 42 against spring 4I. Lever 42 by means of link 43 removes detent 44 from engagement with pawls 1 thereby enabling these pawls to be pressed :by their springs into driving engagement with the ratchet wheels 6. Thus the ratchet clutch drives cam sleeve 2, including selector cam 4.

In order to allow for the delay in release of the cam sleeve 2 with respect to the starting element and to enable the instants at which the selector cam 4 operates the striker pin to be adjusted to coincide with the middle portion of each code element of the received combination, the timing of all the cams can thus be suitably advanced.

Towards the end of the period of rotation of cam disc I0 the lug I2 thereon operates on roller 29 to restore detent lever I4 into position to co-operate with lug II thereon and cam disc I6 is accordingly :ce-arrested in its invariable stopping position.

What is claimed is:

1. Printing telegraph receiver comprising a magnet, an armature therefor, a driving shaft, a selector cam and a starting cam both arranged r coaxially with said driving shaft, a friction clutch for driving said starting cam from said driving shaft, a ratchet clutch for driving said selector cam from said driving shaft, a, detent for holding said starting cam in an invariable stop position against rotation, means for releasing engagement oi said detent from said starting cam upon the response of said armature to the start element oi a signal, a lug on said starting cam, a inember mounted in the path of said lug, manually operable means for adjusting the position oi said member in a path coaxial with said starting cam and means operable upon the coaction of said lug with said member to cause engagement of said ratchet clutch.

2. Printing telegraph receiver as claimed in claim 1 in which said starting cam consists of a disc carrying said lug and a second lug co-operating with said detent.

3. Printing telegraph receiver as claimed in claim 1 comprising a detent lever for holding said ratchet clutch disengaged and a lever lixed thereto and arranged to be operated by engagement of said lug with said member, said last mentioned lever having a curved portion with its centre of curvature lying upon the axis of said driving shaft and said starting cam.

4. Printing telegraph receiver as claimed in claim 1, in which the detent co-operating with said lug consists of a two armed lever, one arm (3o-operating with said lug to hold said starting cam in stop position and the second arm co-operating with said second lug, immediately prior to the said starting cam reaching stopping position, to restore said rst arm into position to arrest said starting cam.

5. Printing telegraph receiver according to claim 1 in which the detent cooperating with said lug consists of a two-armed lever, one arm cooperating with said lug to hold said starting cam in stopped position and the second arm cooperating with said second lug immediately prior to the said starting cam reaching stop position to restore said rst arm into position to arrest said starting cam, a spring for removing said detent lever from engagement with said lug, a springactuated retaining lever cooperating with said second arm to hold said detent lever in position to arrest said starting cam, and a latch controlled by said armature for withdrawing said retaining lever from said detent lever upon the response of said armature to the starting element of a signal.

6. Printing telegraph receiver according to claim 1 in which the detent cooperating with said lug consists of a two-armed lever, one arm cooperating with said lug to hold said starting cam in stop position, and the second arm cooperating with said second lug immediately prior to the said starting cam reaching said stop position to restore said rst arm into the position to arrest said starting cam, a spring for removing said detent lever from engagement with said lug, a spring-actuated retaining lever cooperating with said second arm to hold said detent lever in position to arrest said starting cam, a latch controlled by said armature for withdrawing said retaining lever from said detent lever upon the response of said armature to the starting element of the signal, and a spring blade mounted on said second arm to guide said latch to engage the said retaining lever in said withdrawal and to hold said latch clear of said retaining lever during the following code elements of the signal.

7. Printing telegraph receiver according to claim 1 in which the detent cooperating with said lug consists of a two-armed lever, one arm cooperating with said lug to hold said starting cam in stop position and the second arm cooperating with said second lug immediately prior to the said starting cam reaching stopping position to restore said iirst arm into position to arrest said starting cam, a spring for removing said detent lever from engagement with said lug, a spring-actuated retaining lever cooperating With said arm to hold said detent lever in position to arrest said starting cam, a latch controlled by said armature for withdrawing said retaining lever from said detent lever upon the response of said armature to the start element of the signal, a spring blade mounted on said second arm to guide said latch to engage the said retaining lever in said withdrawal and to hold said latch clear of said retaining lever during the following code elements of the signal, and a step on said second arm to hold said spring co-operating with said lug to hold said starting position of the latch.

REGINALD DENNIS SALMON.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 1,924,357 Griflith Aug. 29, 1933 2,115,991 Kleinschmidt May 3, 1938 Certificate of Correction Patent No. 2,505,008 April 25, 1950 REGINALD DENNIS SALMON It is hereby certified that errors appear in the printed specieation of the above numbered patent requiring correction as follows:

Column 6, line 41, strike out the Words co-operating with said lug to hold said starting and insert instead blade from pressing on said latch n the normal;

and that the said Letters Patent should be read With these corrections therein that the same may conform to the Vrecord of fthe cese in the Patent Oce.

Signed and sealed this 25th day of July, A. D. 1950.

THOMAS F. MURPHY,

Assistant Oommz'saz'oner of Patents.

Certificate of Correction Patent N o. 2,505,608 April 25, 1950 REGINALD DENNIS SALMON It is hereby certied that errors appear in the printed specification of the above numbered patent requiring correction as follows:

Column 6, line 4l, strike out the Words co-operating with said lug to hold said starting and insert instead blade from pressing on said latch 'la the normal;

and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 25th day of July, A. D. 1950.

[IML] THOMAS F. MURPHY,

Assistant Gommz'ssz'oner of Patents. 

